<!DOCTYPE html>
<html>
<head>
  <script src="jquery1.3.2.js"></script>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <title>注册界面</title>
</head>
<body>
  <center>
    <h1>用户注册</h1>
    <form action="" method="post">
      <table width="400px" cellspacing="0px" cellpadding="0px">
        <tr>
          <td>用户名</td>
          <td><input type="text" name="username" placeholder="用户名为3-12位字母数字或下划线组合" ></td>
        </tr>
        <tr>
          <td>密 码</td>
          <td><input type="password" name="password" placeholder="密码长度为6-12位的纯数字" id="password"></td>
        </tr>
        <tr>
          <td>确认密码</td>
          <td><input type="password" name="checkPWD" placeholder="密码长度为6-12位的纯数字" id="checkPWD" onchange="check_password()"></td>
        </tr>
        <tr>
          <td>手机号码</td>
          <td><input type="text" name="phone" placeholder="请输入正确的手机号码格式" id="phone" onchange="check_phone()"></td>
        </tr>
        <tr>
          <td>邮箱</td>
          <td><input type="email" name="email" placeholder="请输入正确邮箱格式" id="email"  ></td>
        </tr>
        <tr>
          <td colspan="2" style="text-align:center">
            <input type="submit" value="注册">
            <input type="reset" value="重置">
          </td>
        </tr>
      </table>
    </form>
  </center>

  <script type="text/javascript">
    function check_password() {
      if ($("#password").val() != $("#checkPWD").val()){
        alert("请保证两次输入密码的一致性！");
        $("#checkPWD").focus();
      }
    }
    function check_email() {
      var reg = /\w+[@]{1}\w+[.]\w+/;
      if (!reg.test($("#email").val())){
        alert("请输入正确的email！");
        $("#email").focus();
      }
    }
    function check_phone() {
      var reg = /^1[34578]\d{9}$/;
      if (!reg.test($("#phone").val())){
        alert("请输入正确的手机号！");
        $("#phone").focus();
      }
    }
    </script>
</body>
</html>